CN203288333U - Aluminum-alloy-core high shielding cable for frequency converter - Google Patents

Abstract

The utility model discloses an aluminum-alloy-core high shielding cable for a frequency converter. The cable comprises main wire cores and auxiliary wire cores which are respectively provided with insulating layers, wherein a cable core is formed by twisting the main wire cores and the auxiliary wire cores, an inner lining layer is wrapped outside the cable core, and a metal shielding layer, an isolating sleeve, an aluminum alloy belt interlocking and armored layer and an outer sheath are sequentially arranged outside the inner lining layer; and the main wire cores and the auxiliary wire cores are respectively formed by pressing and annealing rare earth aluminium alloy conductors. According to the aluminum-alloy-core high shielding cable, the main wire cores and the auxiliary wire cores are respectively formed by pressing and annealing the rare earth aluminium alloy conductors, and the cable has good creep resistance, flexibility and corrosion resistance; and the cable is formed by frequency-converting 3+3-structured insulated wire cores, the cable has better electromagnetic compatibility due to the exchangeability of the conductors, can offset the odd-order frequency of high-order harmonics and enhance the anti-interference performance of the special cable for a variable frequency motor, and reduces the electromagnetic radiation of an integral system. By arranging the aluminum alloy belt interlocking and armored layer, the cable has more excellent bending resistance and impact resistance than cables adopting other armored types.

Description

Aluminum alloy core high shielding cable for frequency converter

technical field

The utility model mainly relates to a power cable, in particular to a cable with an aluminum alloy core and a high shielding frequency converter.

technical background

In recent years, as various cable companies and research institutes continue to increase the development of aluminum alloy cables and market recognition, more and more aluminum alloy cables are used in various industries, such as power transmission and distribution , steel energy supply, etc., the cables involved are mainly medium and low voltage power cables of 35kV and below. At the same time, the country is advocating the strategy of rejuvenating the country with sustainable development. The lack of copper resources and the slow rate of regeneration have become indisputable facts. Therefore, "substituting aluminum for copper" has become a new starting point for the further development of the cable industry.

At present, for the process structure of variable frequency power cables, copper core conductors, copper tape wrapping (or copper wire braided) shielding layers and galvanized steel tape wrapping are still commonly used as armor layers. The introduction of the utility model cable aims to provide a new type of frequency conversion power cable, whose current carrying capacity is equivalent to that of the copper core, but the conductor and armor layer have relatively enhanced electrochemical corrosion resistance, the cable can be bent, and the bending radius is effectively reduced. Small. The cable of the utility model is a supplement to the existing special power cables for frequency converters, responds to the national sustainable development strategy, and has excellent market application and development prospects.

Contents of the invention

The purpose of this utility model is to provide an aluminum alloy core high-shielding cable for inverters, which not only ensures its basic functions of normal power transmission and distribution, but also improves the resistance to electrochemical corrosion to a certain extent compared with copper wire conductors and steel tape armor layers. ability, but also can effectively improve its bending performance.

The utility model is achieved through the following technical solutions:

The aluminum alloy core high-shielded cable for frequency converter is characterized in that it includes main and auxiliary wire cores wrapped with insulating layers respectively, the main and auxiliary wire cores are twisted into a cable core, the cable core is wrapped with an inner liner, and the inner liner is outside the inner liner. A metal shielding layer, a spacer sleeve, an aluminum alloy tape interlocking armor layer and an outer sheath are provided in sequence; the main and auxiliary wire cores are respectively formed by pressing and annealing rare earth aluminum alloy conductors.

The aluminum alloy core high-shielding cable for frequency converter is characterized in that the insulating layers are respectively cross-linked polyethylene, fluoroplastic or silicon rubber.

The aluminum alloy core high-shielding cable for inverters is characterized in that: the inner lining layer is formed by overlapping and wrapping two or three layers of PE on the outside of the cable core.

The aluminum alloy core high-shielding cable for frequency converters is characterized in that the metal shielding layer is shielded by wrapping copper tape, braided copper wire or a combined structure of copper tape and copper wire.

The main and auxiliary wire cores are rare earth aluminum alloy conductors, which are formed by circular stranding and annealing; the outer conductors are extruded with cross-linked polyethylene low-temperature materials or high-temperature materials such as fluoroplastics and silicon rubber, which can be determined according to the cable laying environment Insulating material; the main and auxiliary wire cores are wrapped tightly in cables and filled round; the inner lining is wrapping type, and two or three layers of PE tape are overlapped and wrapped for electrical insulation; the metal shielding layer can be used according to the cable laying environment Choose copper tape wrapped shielding, copper wire braided shielding or a combined structure of metal wire and metal tape; for armored cables, an isolation sleeve should be extruded outside the metal shield, and the aluminum alloy belt should be self-locking and interlocked outside the isolation sleeve. Armoring: The outer sheath of the interlocking armoring layer is an extruded outer sheath, and its temperature resistance level is consistent with the long-term working temperature of the conductor.

The beneficial effects of the utility model are:

The utility model replaces copper conductors with rare-earth aluminum alloy conductors to ensure the carrying capacity of the cables while reducing the weight of the cables by about 30%. Sex, because when the rare earth aluminum alloy wire is oxidized, a thin layer of aluminum oxide anti-oxidation layer will be formed on the surface to avoid continuous oxidation inside. At the same time, the arrangement of the aluminum alloy belt interlocking armor layer can effectively improve the bending resistance of the utility model, and the bending radius can be reduced to 8 times, which is far lower than 12 times of the ordinary inverter cable. This cable is especially suitable for use in harsh environments such as public buildings with a rated voltage of 3kV and below, iron and steel smelting high-temperature industries, etc., where there is a high requirement for anti-electromagnetic interference.

In the utility model, the rare-earth aluminum alloy conductor is annealed by circular compression first, and the compression coefficient is controlled above 0.91, and the cross-linked polyethylene insulating material is extruded outside the rare-earth aluminum alloy conductor, and then twisted into a cable, wrapped with PE tape As the wrapping inner liner, set metal shielding layer, copper tape wrapping shielding or copper braided shielding or the combination of the two, and then extrude PVC isolation sleeve, as the insulation and electrical isolation of the metal shielding layer and the armored layer, and then And set the aluminum alloy belt interlocking armor layer, and finally extrude the PVC outer sheath. The main and auxiliary wire cores are made of rare earth aluminum alloy material, which has good creep resistance, flexibility and corrosion resistance; the insulation layer is made of high-quality cross-linked polyethylene insulation to ensure that the cable has excellent performance. At the same time, the dielectric loss of this material is small, and the heat loss of the cable is reduced, which helps to improve the current carrying level of the cable; the frequency conversion 3+3 structure insulated wire core is cabled, and due to the interchangeability of the wires, it has better electromagnetic phase. Capacitance, which can offset the odd frequency in the high-order harmonics, improve the anti-interference performance of the special cable for variable frequency motors, and reduce the electromagnetic radiation in the entire system. The setting of aluminum alloy belt interlocking armor layer has more excellent bending resistance and impact resistance than other armor types.

Description of drawings

Fig. 1 is a structural representation of the utility model.

In the picture: 1-main and auxiliary wire cores

2-Insulation layer

3- Lining layer

4- Metal shield

5- Isolation sleeve

6- Aluminum alloy with interlocking armor

7- Outer sheath

Detailed ways

As shown in the figure: the aluminum alloy core high-shielding inverter cable includes main and auxiliary cores 1 wrapped with insulating layers 2 respectively, the main and auxiliary cores 1 are twisted into a cable core, and the cable core is wrapped with an inner lining 3 , the inner lining layer 3 is provided with a metal shielding layer 4, an insulating sleeve 5, an aluminum alloy belt interlocking armor layer 6 and an outer sheath 7 in sequence; the main and auxiliary wire cores 1 are respectively tightly pressed by rare earth aluminum alloy conductors Annealed.

The insulating layer 2 is respectively cross-linked polyethylene, fluoroplastic or silicon rubber.

The inner lining layer 3 is formed by overlapping and wrapping two or three layers of PE outside the cable core.

The metal shielding layer 4 is shielded by wrapping copper tape, braided copper wire or a combined structure of copper tape and copper wire.

Claims (4)

1. the aluminium alloy core height shields Cable for frequency changer, it is characterized in that: include the major and minor core of wrap insulate layer respectively, major and minor core is twisted into cable core, and cable core is surrounded with inner covering outward, and inner covering is provided with metal screen layer, separation sleeve, aluminum alloy strip lock armo layer and oversheath outward successively; Described major and minor core is respectively to press annealing by rare earth aluminum alloy conductor to form.

2. aluminium alloy core height according to claim 1 shields Cable for frequency changer, and it is characterized in that: described insulating barrier is respectively crosslinked polyethylene, fluoroplastics or silicon rubber.

3. aluminium alloy core height according to claim 1 shields Cable for frequency changer, and it is characterized in that: described inner covering is by 2 layers or three layers of PE overlapping wrapped forming outside cable core.

4. aluminium alloy core height according to claim 1 shields Cable for frequency changer, it is characterized in that: described metal screen layer is by the wrapped shielding of copper strips, proof copper-wire braided shielding or copper strips and the shielding of copper wire combining structure.

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